Threat Intelligence Brief
Curated summary with source attribution
Source: thehackernews.com
Threat Risk: High
Victim: Enterprise Linux server administrators
Incident: Disclosure of a local privilege escalation vulnerability in XFS filesystems.
Impact: Unprivileged local users can gain persistent root access to the system.
Attacker: Local unprivileged users
Analysis: The vulnerability, tracked as CVE-2026-64600, exploits a stale mapping during copy-on-write operations in XFS. By racing writes against a cloned file, an attacker can overwrite protected root-owned files such as /etc/passwd. This flaw has persisted since 2017, affecting a wide array of enterprise Linux distributions by default.
Recommendations: Update to the latest patched kernel provided by your vendor.; Reboot systems to ensure the updated kernel is active in memory.; Verify XFS reflink status using ‘xfs_info / | grep reflink=’ to assess exposure.
Source: The Hacker News
Editorial note: this post summarizes third-party reporting and links to the original source.
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